Frequencies for first 10,000 rows of uop_stiml variable in natl2005 dataset :

Stimulation |
 of labor U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,607       16.07       16.07
          2 |      8,285       82.85       98.92
          9 |        108        1.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015